AK4183_06 Datasheet, PDF (12/17 Pages) –

ASAHI KASEI
[AK4183]
„ Control Command
The control command, 8 bits, provided to the AK4183 via SDA, is shown in the following table. This command includes start bit,
channel selection bit, power-down bit and resolution bit. The AK4183 latches the serial command at the rising edge of SCL. Refer
to the detailed information regarding the bit order, function, the status of driver switch, ADC input as shown in Table 3.
BIT
Name
Function
7
S
Start Bit. “1” Accelerate and Axis Command, “0”: Sleep mode Command
6-4 A2-A0 Channel Selection Bits. Analog inputs to the A/D converter and the activated driver switches are
selected. Please see the following table for the detail.
3
X1
Don’t care
2
PD0
Power down bit (refer to power-down control)
1
MODE Resolution of A/D converter. “0”: 12 bit output “1”: 8 bit output
0
X2
Don’t care
Input
Status of Driver Switch
ADC input (∆AIN) Reference Voltage
(∆VREF)
S A2 A1 A0 XP XN YP YN AIN+ AIN- VREF+ VREF- Note
011
1
Sleep
100
0 ON ON OFF OFF YP
XN
XP
XN Accelerate X-Driver
100
1 OFF OFF ON ON XP
YN
YP
YN Accelerate Y-Driver
101
0 OFF ON ON OFF XP
XN
YP
XN Accelerate Y+,
101
1 OFF ON ON OFF YN
XN
YP
XN X- Driver
110
0 ON ON OFF OFF YP
XN
XP
XN X-axis
110
1 OFF OFF ON ON
XP
YN
YP
YN Y-axis
111
0 OFF ON ON OFF XP (Z1) XN
YP
XN Z1 (Pen Pressure)
111
1 OFF ON ON OFF YN (Z2) XN
YP
XN Z2 (Pen Pressure)
„ Power-down Control
Table 3 Control Command List
A/D converter and power-down control of touch driver switch are determined by PD0 bit.
PD0 PENIRQN
Function
0
Enabled
Auto power-down Mode
A/D converter is automatically powered up at the start of the conversion, and goes to power-
down state automatically at the end of the conversion. All touch screen driver switches except for
YN switch are turned off and relative pins are open state. Only YN driver switch is turned ON
and YN pin is forced to the ground in this case. PEN interrupt function is enabled except for the
sampling time and conversion time.
1
Disabled ADC ON Mode
When X-axis or Y-axis are selected on the write operation with PD0 = “1” A/D converter and
touch panel driver are always powered up until next conversion. This mode is effective if more
settling time is required to suppress the electrical bouncing of touch plate.
PEN interrupt function is disabled and PENIRQN is forced to “L” state
Table 4 Powers –Down Control
MS0500-E-00
12
2006/04